GD and Image 函数
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iptcparse

(PHP 4, PHP 5)

iptcparse — 将二进制 IPTC » http://www.iptc.org/ 块解析为单个标记

说明

array iptcparse ( string $iptcblock )

本函数将一个二进制的 IPTC 块解析为单个的标记。返回一个数组，用 tagmarker 作为索引，以其值为值。如果出错或未发现 IPTC 数据则返回 FALSE。例子见 getimagesize()。

参数

iptcblock

A binary IPTC block.

返回值

Returns an array using the tagmarker as an index and the value as the value. It returns FALSE on error or if no IPTC data was found.

范例

Example #1 iptcparse() used together with getimagesize()

<?php
$size = getimagesize('./test.jpg', $info);
if(isset($info['APP13']))
{
    $iptc = iptcparse($info['APP13']);
    var_dump($iptc);
}
?>

注释

Note:

此函数不需要 GD 图象库.

GD and Image 函数
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PHP手册 - N: 将二进制 IPTC http://www.iptc.org/ 块解析为单个标记

用户评论:

www.peterdebruin.net (22-Jul-2011 09:12)

Nowadays IPTC captions may be encoded in UTF-8.
In that case, IPTC tag CodedCharacterSet would be set to "ESC % G".
This tag has tag marker "1#090".
To decode such a caption into simple ISO-8859-1, you could use the following code:

<?php
$IPTC_Caption = "";
$size = getimagesize( $image_path, $info );
if (isset($info["APP13"])) {
    if($iptc = iptcparse( $info["APP13"] ) ) {
        $IPTC_Caption = str_replace( "\000", "", $iptc["2#120"][0] );
        if(isset($iptc["1#090"]) && $iptc["1#090"][0] == "\x1B%G")
            $IPTC_Caption = utf8_decode($IPTC_Caption);
    }
}
?>

Of course, this will only preserve ISO-8859-1 characters.
For proper Unicode support, you should convert UTF-8 byte sequences into HTML character entities, or encode the whole web page in UTF-8.

michael wells (03-Sep-2004 01:06)

To import IPTC keywords (which are stored in an array) into a scalar, try this sort of approach:

$keywordcount = count($iptc["2#025"]);
for ($i=0; $i<$keywordcount; $i++) $keywords .= $iptc["2#025"][$i] . " ";

(you could strip the trailing space if you wanted).

If you are importing data from some Mac applications, they may put chr(213) into strings to access a closing quote character. This prints as a captial O with a tilde above it in a web browser or on Windows. You can fix this with:

function ConvertChars($in)
{
        return str_replace(chr(213),"'",$in);
}

We use aspects of this code at www.thirdlight.com when parsing IPTC tags. XMP seems to be the better solution these days (being XML based is a great improvement!!).

evan at nospam dot ozhiker dot com (09-Aug-2004 05:57)

You might have noticed that several metadata fields in Photoshop are not available via IPTC.

I have written a library "PHP JPEG Metadata Toolkit" which fixes this problem as it allows reading, writing and interpreting of virtually any type of metadata, including these missing fields.

Try it out, and download it at:
http://www.ozhiker.com/electronics/pjmt/index.html

(06-Feb-2004 07:17)

View all availiable IPCT Data

function output_iptc_data( $image_path ) {   
    $size = getimagesize ( $image_path, $info);       
     if(is_array($info)) {   
        $iptc = iptcparse($info["APP13"]);
        foreach (array_keys($iptc) as $s) {             
            $c = count ($iptc[$s]);
            for ($i=0; $i <$c; $i++)
            {
                echo $s.' = '.$iptc[$s][$i].'<br>';
            }
        }                 
    }            
}

Scin (14-Oct-2002 11:52)

If you are not sure where a particular value you entered into the IPTC block in photoshop or any other software is being stored, simply run a foreach loop thru the block and find out:

(Insert a new paragraph in the beggening of the first echo)

$size = GetImageSize ("testimg.jpg", &$info);
$iptc = iptcparse($info["APP13"]);

foreach($iptc as $key => $value)
{
    echo "<b>IPTC Key:</b> $key <b>Contents:</b> ";
    foreach($value as $innerkey => $innervalue)
    {
        if( ($innerkey+1) != count($value) )
            echo "$innervalue, ";
        else
            echo "$innervalue";
    }
}

(26-Apr-2002 03:28)

Just to add to the above response, he missed a couple of IPTC tags:

Keywords:
$iptc["2#025"][n];   (there is a list of keywords)

Caption Writer:
$iptc["2#122"][0];

Just figured I'd note it, as the keywords can be quite important for database applications.  I got these by extracting IPTC tags from a Photoshop 6.0 file, so hopefully they are standardized ;)

pkrohn at daemonize dot com (16-Jul-2001 12:35)

This took me longer than it ought to to figure out. Very handy for handling a stream of photos where the info you want is in the IPTC header. This example passes by reference, for which PHP4 will yell at you. If your need to write into the header, check out the Image::IPTCInfo Perl module.

$size = GetImageSize ("$image_name",&$info);
$iptc = iptcparse ($info["APP13"]);
if (isset($info["APP13"])) {
    $iptc = iptcparse($info["APP13"]){
        if (is_array($iptc)) {
        $caption = $iptc["2#120"][0];
    $graphic_name = $iptc["2#005"][0];
        $urgency = $iptc["2#010"][0];   
    $category = $iptc["2#015"][0];   
    // note that sometimes supp_categories contans multiple entries
$supp_categories = $iptc["2#020"][0];
$spec_instr = $iptc["2#040"][0];
$creation_date = $iptc["2#055"][0];
$photog = $iptc["2#080"][0];
$credit_byline_title = $iptc["2#085"][0];
$city = $iptc["2#090"][0];
$state = $iptc["2#095"][0];
$country = $iptc["2#101"][0];
$otr = $iptc["2#103"][0];
$headline = $iptc["2#105"][0];
$source = $iptc["2#110"][0];
$photo_source = $iptc["2#115"][0];
$caption = $iptc["2#120"][0];    }}